Of Winds and Sounds,

be evident by the small Pieces of Paperf h, hung upon the Middle of every

fc%^oved

°°t-Length, suddenly leaping off; while. so g, r, remain un-String at the End of

e other Pieces a, c,

upon

the

r y Foot, where the Vibrations seve-f begin and end, and consequently^bere the Line has no Motion at all

fyll

3 t) jj^X) j. What is here said relating to Mirrours,i* the Colours of Light, will be explained and de-i^rated in its proper Place. That one String At|j y Q be put into Vibration by another B, by means of.Air, is not strange, because the Air will affect theA with the same Impulses it receives itself from^ String B. If therefore the String A be under theiK e Circumstances with the String B otherwise, (z. e. isH e e of equal Magnitude, and equally tended) it must( ^siarily move in a similar Manner, or vibrate in anTime.

f c 2- If the String A be twice the Length of B, then^ paribus) the Air by its Impulse received from B

w^ot so affect A as to cause it to vibrate through its°‘ e Length ; but it will so affect each Half of A as(Induce a similar Effect, or equal Vibrations. HenceWiring A will become divided in the middle Point,* c h Will be at Rest.

& A. And if the String A were three times as long as^ould be for the fame Reason divided into three^ith ’ w hose Vibrations are synchronous to those of B,Ckl hvo Points of Rest between; and so on for any3 to r length. Also, if the Lengths of A and B are asthe ^en if they are Concords, and one be struck,W *U he put into, Motion by Degrees, and inManner that will alter the Vibrations'of the firstand each will vibrate by their aliquot Parts,

^erefore in equal Times..

I